Hearing instrument



FIG. 1 is a front view of the hearing instrument showing our new design;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a left side elevation view thereof; and,

FIG. 7 is a bottom perspective view thereof. 

CLAIM The ornamental design for a hearing instrument, as shown and described. 